Definition of undoubtedly in US English:

undoubtedly

adverb

  • Without doubt; certainly.

    ‘they are undoubtedly guilty’
    • ‘However, there is an obvious problem that may undoubtedly arise from such a change in the rules.’
    • ‘The UK is likely to pay more as a result, but that money will undoubtedly be better spent.’
    • ‘This is pretty challenging stuff, and we will undoubtedly have our work cut out to achieve this.’
    • ‘Bacteria evolve so fast they will undoubtedly find a way to overcome this, too.’
    • ‘This one is a messy divorce and one due undoubtedly to wholly irreconcilable differences.’
    doubtless, indubitably, doubtlessly, no doubt, without doubt, without a doubt, beyond doubt, beyond a doubt, beyond the shadow of a doubt
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Pronunciation

undoubtedly

/ˌənˈdoudədlē//ˌənˈdaʊdədli/